Separable supporting and polarity attachment-plug.



M. H. SHOENBERG. SEPARABLE SUPPORTING AND POLARITY ATTACHMENT PLUG.

APPLICATION FILED OCT. 12, 1915- Patented Sept. 11', 191?,

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on sans area MILTON H. SHOENBERG; OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO MAJESTIC ELECTRIC DEVELOPMENT COMPANY, A CORPORATION OF CALIFORNIA.

SEPARAZBLE SUPPORTING AND POLAEI'I'Y ATTAGHIVLIENT P LUG.

wearer.

Specification of Letters Patent. Patented Sept, 11, tor a.

Application filed October 12, 1915. SeriaI No. 55,555.

To all whom it may concern:

Be it known that I, MILTON H. SHOEN- BERG, a citizen of the United States, residing at San-Francisco, in the county 0 San Francisco and State of California, ha e invented certain new and useful Improvements in separable Supporting and Polarity Attachment-Plugs, of which the following is a specification.

This invention has for its object to provide an attachment plug which will support any device that may be secured thereto, such as a drop light or electric heater, in case the plug sections become accidentally separated or in case they are separated for the purpose of,permitting such device to 0001. My invention also provides an attachment plug which always maintains the same pole or line terminal on the same terminal of the plug.

Separable attachment plugs prior to my invention permit the cap member of the plug to be entirely separated'fromthe base member. The cap member is ordinarily secured to the base bymeans of, the spring.

tension of the contact plates which are usually provided with interfitting socket and lug connections or similar detachable locking means. In case a drop light or electric .heater is suspended by the conductor cord, therefrom, the cap is liable to become 100s.

ened, permitting the lamp Or heater to fall and become injured. One of the main objects of my invention is to provide means for supporting the cap member from the base when the parts are accidentally or purposely separated.

In the accompanying drawings Figure 1 is a perspective view of a separable attachment plug having my securing device applied thereto; F ig. 2 is a vertical section of the same showing the cap and base members separated; Fig. 3 is a vertical section in a plane perpendicular to that of Fig. 2, and showing the cap and base members in closed or interlocked position; and Figs. 4 and 5 are cross-sectional views on the lines 4-4 and 55 of Fig. 2.

The base and cap members of the plug may be of the usual construction, the base 1, of insulating material having the central contact plate 3, and the screw shell 4:, which are provided respectively with spring conbase member; and the cap member 15, being provided with contact plates l6, 17, having spring contact tongues 18, 19, adapted to engage the tongues 6, 7 of the base, .this construction being well understood by those familiar with electrical appliances. The conductor cord 20 passes through the central aperture 21 of the cap and has its wires secured to the contact plates by screws 23, 24, which are relieved of the weight of the cord and device suspended therefrom by tying a knot 25 in the cord so that the latter will bear upon the inner walls of the cap surrounding the central aperture.

With the construction above described the cap is secured to' the base merely by the spring pressure of the contact tongues 18, 19 against the tongues 6, 7, and in case these parts become disengaged, the cap member 15 and any device supported thereby, such as a lamp or heater, will fall and probably be injured. I therefore provide a permanent connection between the base and cap members which will permit the separation of these parts sufiicient to disconnect the spring contact arms or tongues but will positively support the cap upon the base. I have shown this positive connection in the form of a yoke or strap 30, which may be of metal or other suitable material, fastened in any suitable manner to the base, as by screws 31, 32, passing through apertures or notches in the peripheral flange 1 The opposite ends of the yoke arms are bent inwardly at 30*, 30 to form stops to arrest the outward movement of the cap 15 and upon which it is positively held. The cap member may be slid within the yoke arms from the outermost position shown in Fig. 2, in which the 5 have shown the cap member provided with lateral grooves which embrace the yoke arms but any other suitable connection may be employed.

While the main purpose of the Connecting yoke 30 is to support the cap member, and any device attached thereto, when in the disconnected position shown in Fig. 2, this construction also insures the connection of the same cord terminals with the socket terminals into which the plug is inserted which is important when connecting certain electrical instruments to the line or supply conductors. While I have illustrated my supporting attachment in connection with a separable plug attachment in which the base is rotated when screwing it into the socket,

it is'obvious that I may employ an attachment plug in which only thescrew thread connecting member rotates while the plug remains stationary.

I have particularly described the construction illustrated in the accompanying drawings for purpose of disclosing an embodiment of my invention, it is obvious that vasecured externally to one member for permitting only a limited separation of said members.

2. A separable attachment plug consisting of base and cap 'inembers, and a supporting device secured to one member and having a sliding engagement with the other member to' permit only a limited separation of said members.

3. A separable attachment plug consisting of base and cap members; and a yoke secured to one member and having its arms arranged upon opposite sides of and movably engaging the other member to limit the separation of the members.

4. A separable attachment plug consisting ofbase and cap members, and a supporting device detachably secured to the base external thereto and engaging the cap to permit a limited movement thereof.

-5. A separable attachment plug comprising base and cap members, a yoke member secured to the base and having arms extending upon either side of the cap, and means for preventing rotary movement of the cap within said arms while permitting longitudinal movement toward and from the base;

In testimony whereof I afiix my signature.

MILTON H. SHOENBERG. 

